[docs] Add Unraid installation documentation

[nwithan8]

Summary

Application is now available in the Unraid Community Apps store:

Adds documentation for how to install and configure application (via Docker) on Unraid.

Related Issues / Discussions

QA Instructions

Verified that Markdown renders correctly in preview, image paths work relative to file locations.

Merge Plan

No expected conflicts, no modifications to existing code or documentation beyond adding a link on an existing page.

Checklist

• The PR has a short but descriptive title, suitable for a changelog
• Tests added / updated (if applicable)
• Documentation added / updated (if applicable)

[hipsterusername]

@nwithan8 - Hey Nate, are you the maintainer of the listing in the Unraid store? Trying to determine who to get in touch with re: the "Official" badge. We're excited to see it in Unraid, but don't want to imply we're maintaining it/supporting it directly

[nwithan8]

@nwithan8 - Hey Nate, are you the maintainer of the listing in the Unraid store? Trying to determine who to get in touch with re: the "Official" badge. We're excited to see it in Unraid, but don't want to imply we're maintaining it/supporting it directly

Hey, yeah, it's an odd quirk with the store plugin. As far as I can tell, something gets labeled as "Official" if the project URL is an actual website versus just a github.com repo, which isn't at all indicative of official support. I have talked with the developer of the store about this before.

To avoid confusion, I can change the project link to be this GitHub repository. That should remove the "Official" tag, but still point users to a relevant webpage.